Chapter ISG, Problem 3.3STP

To determine

To evaluate the given statements

Answer to Problem 3.3STP

The average rate of change between weeks 6 and 14 is 1.15 pounds per week

The average rate of change between weeks 9 and 11 is 0.8 pounds per week

Explanation of Solution

Given information: Puppy’s weight at several ages,

Age (weeks)	Weight (lbs)
6	3.5
9	6.2
11	7.8
14	12.7

Formula used:

Rate of change $=\frac{y2-y1}{x2-x1}$

For the average rate at 6 to 12weeks

Substituting the values in the formula,

  $=\frac{12.7-3.5}{14-6}$

So,

  $=\frac{9.2}{8}$

On solving,

  $=1.15$

Hence, the average rate of change between weeks 6 and 14 is 1.15 pounds per week

For the average rate at 9 to 11 weeks,

Substituting the values in the formula,

  $=\frac{7.8-6.2}{11-9}$

So,

  $=\frac{1.6}{2}$

On solving,

  $=0.8$

Hence, the average rate of change between weeks 9 and 11 is 0.8 pounds per week.